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What is the end goal here?
To allow another server to send email out to the internet via your Exchange server?
If so, then yes that is a common thing to do.
The preferred way to do it is via authentication using the Client Receive connector over TLS.
However if the app doing the sending doesn't support TLS then you will need a custom receive connector.
Only if the app cannot do TLS and authentication is an anonymous relay connector created, which needs to be locked down to a specific address so it cannot be abused.

Simon.

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